Added citation

Author: manjavacas

CITATION.cff

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+abstract: <p>CLOUDY automates the execution of experiments on Google Cloud.&nbsp;</p>
+authors:
+- affiliation: Universidad de Granada
+  family-names: Manjavacas
+  given-names: Antonio
+  orcid: 0000-0001-7334-1074
+cff-version: 1.2.0
+date-released: '2024-10-03'
+doi: 10.5281/zenodo.13885865
+license:
+- cc-by-4.0
+title: Cloudy
+type: software